Last February the A's announced Sizemore had a torn ACL in his left knee and would be forced to miss the entire season after undergoing surgery to repair the ligament.

Wednesday, the A's placed Sizemore on the disabled list and announced he has, in fact, re-torn his left ACL. It goes without saying, but for those who need to see it in writing -- he's out for the season.

Sizemore, 28, hit .245/.342/.399 with 11 homers and 56 RBI in 110 games with the Tigers and A's in 2011. He got six plate appearances for the A's as a second baseman this season, gathering a double as his only hit.